Electromagnetically-operated mechanism for reversing the motion of machine-tools.



PATENTED AUG. 20, 1907.

* E J. BILLETER.

ELBGTROMAGNETIOALLY OPERATED MECHANISM FOR REVERSING THE MOTION OFMACHINE TOOLS.

APPLICATION FILED 001225, 1906.

1 w/ 4 @V d W/// W WI \M a g E g 4 W W r 7 ff LZU UNITED STATES P-ATENTosmos- JULIUS BILLETER, OF ASOHERSLEBEN. GERMANY.

ELEGTnQnAGNE'rIcELY-QPERATED MECHANISMYFOR nnvnnsme THE MOTION OF,

. I MACHINE-TOOLS.

Specification of Letters Patent.v

Patented Au 20, 1907.

Application filed October 25,1905. Serial no 340,513.

To all whom 'it may concern: Be it known that 1, Jones BILLnTER, acitizen of the German Empire, and a resident of 26 Magdeburgert strasse,Aschcrsleben, Prussia, Germany, factory manager, have invented a certainnew and useful Improve:

by means of electro-magnetically operated couplings has been alreadyemployed in large machine tools,

such as planing machines and the like. v

I In comparison with the arrangements hitherto used for the engagementof the clutch or drum in which the changing of transmission straps iseffected from the working table by means of a complicated steeringmechanism, my invention has the. great advantage that in planingm'achinesfor the control of the cutting tool, a step pulley can beemployed so as to obtain-any'required speed, for'the intermittent backtravel of the table. The ,mechanism for the engagement of the drums ofthe coupling with electro magnetic action as hitherto known, isthroughout performed in such a manner that the parts to be coupled, thatis to say, the

magnet. i I

In consequence of this construction allarrangemcnts of this kindhitherto known are weighted with the heavy disadvantage that theynecessitate as a conse quence of their contifiual rotation a complicatedelectric supply, which often causes failure in working and also that asthe electric power directly engages with the clutch, an electric currentof comparatively high intensity must be employed, in order to insure asuificiently" firnr connectionof the parts to be coupled.

Theinvention described hereinrelates to a mechanism for theengagementand disengagement of sheavedrums clutches or transmissionpulleys for machine tools with to and fro moving working tablesparticularly for metal planing machines, which mechanism is controlledby electro magnets, and in which the supply of electricity is easilyarranged, and the consumption of curient considerably decreased, withoutat the same time'weakening thefirm'connection of the coupling parts. aFor this purpose I construct my mechanism in such a manner that theelectromegnet power does not act directly on the parts to be coupled,but acts on the longer arm of an engaging lever, which forms an inter-.mediate link, in such a manner that the latter, the movable clutch,engages alternately with the drum or pulley for the back travel of thetable or with the step pulley for .the operation of the cutting tool.These 'two drums or pulleys are suitably constructed as shown or in themanner of other well known friction clutches.

As in couplings of this kind the clutch need only'pcrform a very smallmovement in either direction, the

relation of the lengths of the lever arms can be easily regulated in,such a manner that, without too great travel of ,the long; arm and at amost reduced consumption of elect .'c current, the pressure on the partsto be coupled is effected, the power of which surpasses by far the powerof attraction of the two solenoids, by which the lever is operated.

The accompanying drawings, show a longitudinal section of my improvedmechanism applied in a planing machine with to and fro moving workingtable.

On the axle a, which isalter'nately driven in the one or the otherdirection, the pulleys or transmission disks b, and c are looselymounted, of which disks one is driven by an open strap and the other bya crossed transmission strap, so that they rotate inopposite directions.As a'shiiting of the transmission straps is not a necessary for thechangingof the direction in which the axle a r0tates,'step pulleys-canbe employed for the straps which control the cutting .tool for thepurpose of obtaining different speeds, without at the same timenecessitating the employment of special intermediate gearings. With thetransmission disk or drum b and step pulley c, the coupling disks orclutches d and e are firmly connected. Between the latter, the couplingpendent movement. -'l he shorter arm of theenjgaging lever 70 whichcanbe tlirned' on the fiifed bolt or' shaft 2' engages with the ring grooveg of the clutch f. The longer arm of the lever 70 is linked to the cores1, m of the fixed solenoids n, Mlfifilfiil charged alternately with thecurrent, so that the longer arm of the lever is drawn at one time to theright hand and at the other. time to the left hand side by the coresland m, alter nately attracted by their surrounding wzres. By this thecoupling box or clutch f is coupled alternately with the drumsor;clutches d and e and thus rotated at one time in the direction of themovement of the one disk and at the other time in that of the otherdisk.-The its movement to the working table, causing thelatter to move to andfro.

In order to charge the solenoids alternately, and inintervalscorresponding to the travel of the working table, a switch maybe suitably arranged on the frame of the working table, the lever ofwhich switch is suitably arranged within reach of ta ip ets movablyarranged on the frame of the working table, and as usually employed forchanging the direction of movement, so that these tappets aftertermination of one travel of the working table always turn the switchlever by-cbunter f stroke in such a manner, that at one time thesolenoid 'n, and at the other time the solenoid o, is inserted into thecircuit. I

WhatI claim and desire to secure by Letters Patent end fork-shaped andadapted to engage said double cone and having its other end ball-shaped,two solenoids oppositely mounted near said ball-shaped end and a doublecore for said solenoids being slotted in the middle to engage the ballend of the lever, substantially as described.

In testimony whereof I afiix my signature.

J'ULIUs BILLETER. In the presence of- R.'KoRsc1-I,

MARIA SCHNEIDER.

